TY - GEN
T1 - MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HAYNES® 282® FABRICATED BY ELECTRON BEAM MELTING
AU - Dryepondt, Sebastien
AU - Kirka, Mike M.
AU - Fernandez-Zelaia, Patxi
AU - Unocic, Kinga A.
N1 - Publisher Copyright:
© 2019 ASM International® All rights reserved.
PY - 2019
Y1 - 2019
N2 - The Haynes® 282® Ni-based superalloy (57Ni-20Cr-10Co-8.5Mo-2.1Ti-1.5Al) is a very promising candidate for the fabrication by additive manufacturing of gas turbine components of complex geometries. Alloy 282 was fabricated by electron beam melting (EBM) and exposed to two different heat treatments, (a) solution anneal (SA) at 1135ºC followed by the standard 2-step aging treatment (2h at 1010ºC plus 8h at 788ºC) and (b) SA followed by 4h 800ºC. Large elongated grains were observed for the as-fabricated and annealed EBM 282 materials, with a γ´ (Ni3(Al,Ti)) average size of ~100 nm and 20 nm, respectively. The as fabricated EBM 282 alloy exhibited good ductility at 20-900ºC and tensile strength slightly lower than the tensile strength of wrought 282. Annealing the alloy resulted in a moderate increase of the alloy strength at 800 and 900ºC but a decrease of the alloy ductility. The creep lifetime at 800ºC, 200MPa of the as fabricated and annealed EBM 282 specimens machined along the build direction was 2 times and 1.5 times superior to the expected lifetime for wrought 282, respectively. For creep specimens machined perpendicular to the build direction, the lifetimes were ~25% lower compared to the wrought alloy. These creep results are directly related to the strong grain texture of the EBM 282 alloy and the limited impact of the initial γ´ (Ni3(Al,Ti)) size on alloy 282 creep properties.
AB - The Haynes® 282® Ni-based superalloy (57Ni-20Cr-10Co-8.5Mo-2.1Ti-1.5Al) is a very promising candidate for the fabrication by additive manufacturing of gas turbine components of complex geometries. Alloy 282 was fabricated by electron beam melting (EBM) and exposed to two different heat treatments, (a) solution anneal (SA) at 1135ºC followed by the standard 2-step aging treatment (2h at 1010ºC plus 8h at 788ºC) and (b) SA followed by 4h 800ºC. Large elongated grains were observed for the as-fabricated and annealed EBM 282 materials, with a γ´ (Ni3(Al,Ti)) average size of ~100 nm and 20 nm, respectively. The as fabricated EBM 282 alloy exhibited good ductility at 20-900ºC and tensile strength slightly lower than the tensile strength of wrought 282. Annealing the alloy resulted in a moderate increase of the alloy strength at 800 and 900ºC but a decrease of the alloy ductility. The creep lifetime at 800ºC, 200MPa of the as fabricated and annealed EBM 282 specimens machined along the build direction was 2 times and 1.5 times superior to the expected lifetime for wrought 282, respectively. For creep specimens machined perpendicular to the build direction, the lifetimes were ~25% lower compared to the wrought alloy. These creep results are directly related to the strong grain texture of the EBM 282 alloy and the limited impact of the initial γ´ (Ni3(Al,Ti)) size on alloy 282 creep properties.
UR - http://www.scopus.com/inward/record.url?scp=85196519054&partnerID=8YFLogxK
U2 - 10.31339/asm.cp.am-epri-2019p0558
DO - 10.31339/asm.cp.am-epri-2019p0558
M3 - Conference contribution
AN - SCOPUS:85196519054
T3 - Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
SP - 558
EP - 569
BT - Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
A2 - Shingledecker, John
A2 - Takeyama, Masao
PB - ASM International
T2 - Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials
Y2 - 21 October 2019 through 24 October 2019
ER -